Seismic　vulnerability　models　of　typical　highway　piers　under　the　near-fault　ground　motions　were　developed　based　on　the　incremental　dynamic　analysis　(IDA)　method.　On　the　selection　criteria　of　ground　motions　determined　by　the　authors,　totally　30　near-fault　or　far-field　earthquake　records　were　selected.　Totally　36　piers　were　designed　as　samples　by　using　the　orthogonal　experimental　design　method.　Each　sample　was　matched　by　all　of　the　selected　ground　motions.　The　numerical　models　of　the　piers　were　established　by　using　OpenSees,　in　which　the　nonlinear　time　history　analyses　were　carried　out　by　the　incremental　dynamic　analysis　method.　For　estimation　of　the　seismic　fragility　parameters,　three　different　methods　were　adopted,　including　the　estimation　method　based　on　the　multiple-stripe　analysis　idea,　the　frequency　point　regression　methods　from　the　Monte　Carlo　sampling　and　the　two-dimensional　probability　density　function　integration.　The　fragility　curves　were　then　built　up　accordingly.　The　following　results　can　be　obtained　from　the　analysis:　I)　the　probability　of　collapse　is　higher　under　near-fault　ground　motions　whereas　lower　under　the　far-field　motions,　i.e.,　the　other　three　damage　states　are　more　likely　to　happen,　when　given　the　same　intensity　of　ground　motions;　II)　by　considering　two　damage　indexes,　the　median　values　of　the　fragility　curves　decrease　sharply　compared　to　those　with　single　damage　index,　which　means　the　pier　damage　probability　increased.　Based　on　the　results,　it　is　found　that　the　use　of　two　damage　indexes　yields　more　accurate　evaluation　for　the　seismic　risks　of　the　pier　damage　and　decision　making　of　the　seismic　retrofit　prioritization.　©　2017　National　Technical　University　of　Athens.　All　rights　reserved.